Solve for X - square root infinite

Solve for x:

x =

I have been stuck on this problem, was hoping for some help. Really confused about the square root under the square root and so on to infinity. Not sure where to begin hoping to be showed steps that get me to an answer. Thanks

I have been stuck on this problem, was hoping for some help. Really confused about the square root under the square root and so on to infinity. Not sure where to begin hoping to be showed steps that get me to an answer. Thanks